36 psi is normal per door placard most likely.

If you want more even wear, try 40 psi, keeps the edges (corners) from losing tread/traction faster than the centre. Works for me.

Sidewall likely says 44 psi (or thereabouts) MAX, which is the safe maximim pressure for the tire, measured cold. All pressures should be measured cold per your Owner Manual and tire care sites.
Tire Stuff:
- tire air pressure changes about 1 psi with ever 10F degree temperature change.

- Maximum Inflation Pressure:

A tire's maximum inflation pressure is the highest "cold" inflation pressure that the tire is designed to contain. However the tire's maximum inflation pressure should only be used when called for on the vehicle's tire placard or in the vehicle's owners manual. It is also important to remember that the vehicle's recommended tire inflation pressure is always to be measured and set when the tire is "cold." Cold conditions are defined as early in the morning before the day's ambient temperature, sun's radiant heat or the heat generated while driving have caused the tire pressure to temporarily increase.
For the reasons indicated above, It is also normal to experience "hot" tire pressures that are up to 5 to 6 psi above the tire's recommended "cold" pressure during the day if the vehicle is parked in the sun or has been extensively driven.

- UTQG Standards. Use those for comparing tires for traction, wear, load, etc:

The U.S. Department of Transportation (DOT) National Highway Traffic Safety Administration's (NHTSA) Uniform Tire Quality Grade Standards (UTQG) were originated to provide consumers with useful information to help them purchase tires based on their relative treadwear, traction and temperature capabilities. While it is required by law for most passenger car tires sold in the United States, it is not required for deep treaded light truck tires, winter/snow tires, temporary spare tires, trailer tires, tires under 12” in diameter and other select tires.

- Lots of Tire Info:

Air Pressure - Correct, Underinflated and Overinflated at http:///www.tirerack.com/tires/tiretech/techpage.jsp?techid=1
Here's a list of topics linked to at that site:
Most Popular Links
Air Pressure - Correct, Underinflated and Overinflated
Air Pressure vs. Dry Performance
Air Pressure vs. Wet Performance
Air Pressure, Temperature Fluctuations
Air Pressure/Load Adjustment for High Speed Driving
Air Pressure: When and How to Set
Alignment
Breaking In Your Tires
Calculating Tire Dimensions
Checking Tire Inflation Pressure
Determining the Age of a Tire
Diameter Comparison of Light Truck Tire Sizes
How Do I Compare Price vs. Value?
How to Read Speed Rating, Load Index & Service Descriptions
Load Range/Ply Rating Identification
Match Mounting to Enhance Tire & Wheel Uniformity
Load Reduction of Euro- and P-Metric Tires on Light Trucks
Measuring Tire Tread Depth with a Coin
Mounting and Balancing
P-Metric and Euro Metric Tire Sizing
Run-Flat Tires
Selecting the Right Tires
Sidewall Markings
Specific Mileage Warranties
The Plus Concept
Tire & Wheel Owner's Manual
Tire & Wheel Package Installation Instructions
Tire & Wheel Package Ride Uniformity Confirmation
Tire Pressure Monitoring Systems
Tire Rotation
Tire Size Conversion Chart
Tire Size Information
Tire Warranties
Uniform Tire Quality Grade (UTQG) Standards
Where to Install New Pairs of Tires?

 

Well... I'll be "one of those guys" for this one.
I bend over and read what the tire says about max psi vs load.

 

I wouldn't set my tires to their MAX psi unless the car was loaded to it's max capacity.........that is why there is a psi sticker on the drivers door

 

Quite likely to be 36 psi, which is roughly 250 kPa, and should be measured when the tires are cold. Do check and verify on the driver's side door frame though.

Nate

 

Should be on a sticker on the drivers door frame.